From: Arjan van de Ven <arjan@infradead.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: David VomLehn <dvomlehn@cisco.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux USB Mailing List <linux-usb@vger.kernel.org>,
Linux Embedded Mailing List <linux-embedded@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: Wait for console to become available, v3.2
Date: Tue, 21 Apr 2009 06:35:49 -0700 [thread overview]
Message-ID: <20090421063549.3b71881d@infradead.org> (raw)
In-Reply-To: <20090421064346.GB8020@elte.hu>
On Tue, 21 Apr 2009 08:43:46 +0200
Ingo Molnar <mingo@elte.hu> wrote:
> The proper approach would be to use one of the async_synchronize*()
> facilities in kernel/async.c to properly order the opening of the
> console with device init.
Unfortunately this is not the answer.
First of all, USB does not use the async_* infrastructure, so it does
not do anything.
But more importantly... USB *CANNOT* do this fundamental operation.
USB does not have the capability to know when you have seen all devices
that are connected. Devices just show up a random amount of time after
you turn the power on for the bus.... there's no "and now we've seen
all" operation.
--
Arjan van de Ven Intel Open Source Technology Centre
For development, discussion and tips for power savings,
visit http://www.lesswatts.org
next prev parent reply other threads:[~2009-04-21 13:35 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-20 23:40 Wait for console to become available, v3.2 David VomLehn
2009-04-21 6:43 ` Ingo Molnar
[not found] ` <20090421064346.GB8020-X9Un+BFzKDI@public.gmane.org>
2009-04-21 7:13 ` David Brownell
2009-04-21 8:03 ` Ingo Molnar
2009-04-21 17:11 ` David Woodhouse
2009-04-21 17:29 ` David VomLehn
[not found] ` <20090421172929.GC8251-CFZJ1or75eBPWxJt6d6B6bQa8qPdvLwY@public.gmane.org>
2009-04-21 17:37 ` Linus Torvalds
2009-04-21 17:59 ` David VomLehn
2009-04-21 17:41 ` David Woodhouse
2009-04-21 17:31 ` Linus Torvalds
[not found] ` <alpine.LFD.2.00.0904211016190.2199-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2009-04-21 19:25 ` Alan Cox
2009-04-21 23:17 ` David VomLehn
2009-04-22 8:25 ` Jamie Lokier
2009-04-22 9:11 ` Alan Cox
[not found] ` <20090422101109.7beee3ee-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org>
2009-04-22 10:39 ` Jamie Lokier
2009-04-21 13:35 ` Arjan van de Ven [this message]
[not found] ` <20090421063549.3b71881d-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2009-04-21 13:50 ` Ingo Molnar
[not found] ` <20090421135034.GA30114-X9Un+BFzKDI@public.gmane.org>
2009-04-21 14:05 ` Jamie Lokier
2009-04-21 14:26 ` Ingo Molnar
[not found] ` <20090421142627.GA18129-X9Un+BFzKDI@public.gmane.org>
2009-04-21 14:37 ` Alan Cox
2009-04-22 8:22 ` Jamie Lokier
2009-04-22 9:13 ` Alan Cox
2009-04-21 16:42 ` David VomLehn
2009-04-21 14:36 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.0904211026080.2981-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2009-04-21 16:52 ` David VomLehn
2009-04-21 19:09 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.0904211457150.3986-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2009-04-21 23:08 ` David VomLehn
2009-04-22 15:40 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.0904221111320.3405-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2009-04-22 20:54 ` David VomLehn
2009-04-22 21:08 ` Alan Cox
2009-04-22 21:24 ` Alan Stern
2009-04-24 0:35 ` David VomLehn
[not found] ` <20090424003555.GA31173-CFZJ1or75eBPWxJt6d6B6bQa8qPdvLwY@public.gmane.org>
2009-04-24 19:20 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.0904241502440.4531-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2009-04-24 21:32 ` David VomLehn
2009-04-24 22:19 ` Jamie Lokier
[not found] ` <20090424221951.GC18260-yetKDKU6eevNLxjTenLetw@public.gmane.org>
2009-04-24 23:10 ` David VomLehn
[not found] ` <20090424231013.GA18340-CFZJ1or75eBPWxJt6d6B6bQa8qPdvLwY@public.gmane.org>
2009-04-25 1:41 ` Jamie Lokier
2009-04-25 3:11 ` Alan Stern
2009-04-26 19:52 ` Jamie Lokier
2009-04-26 21:20 ` Alan Stern
2009-04-26 21:37 ` Jamie Lokier
2009-04-26 22:36 ` Kay Sievers
2009-04-26 23:12 ` Jamie Lokier
2009-04-26 23:23 ` Kay Sievers
2009-04-26 23:46 ` Jamie Lokier
[not found] ` <20090425014152.GD23106-yetKDKU6eevNLxjTenLetw@public.gmane.org>
2009-04-26 17:55 ` David VomLehn
2009-04-22 5:35 ` David VomLehn
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